Whether a wind speed of 10 to 20 miles per hour (mph) is considered strong depends entirely on context and perception. While a casual observer might find a 20 mph wind noticeable, meteorologists classify wind speeds using objective, standardized measurements. Perception is highly subjective; what feels like a “strong” breeze in a sheltered area might be considered light wind on an open coastline. To accurately assess this range, it is necessary to look at established scientific metrics and the practical effects on daily life.
Understanding Wind Speed Using the Beaufort Scale
The Beaufort Wind Scale provides a standardized framework for estimating wind strength based on observable effects on land and sea. The 10 to 20 mph range spans three distinct categories on this scale.
- A wind speed of 10 to 12 mph is a Gentle Breeze (Force 3), felt on the face, causing leaves and small twigs to be in constant motion.
- 13 to 18 mph is classified as a Moderate Breeze (Force 4). This level moves small branches and raises dust or loose paper from the ground.
- 19 to 20 mph touches the lower limits of a Fresh Breeze (Force 5), where small, leafy trees begin to sway.
Based on these meteorological standards, 10 to 20 mph is not classified as a “strong” wind, which typically begins at 25 mph or higher, but rather a moderate air movement.
Visual Cues of 10 to 20 MPH Winds
The physical environment provides clear visual confirmation of winds in this speed range.
- At the lower end (around 10 mph), light flags fully extend, and small, dry leaves are blown along the ground. The constant movement of leaves and small twigs indicates a Gentle Breeze.
- As the wind increases toward 15 mph, the effects become more pronounced. Small branches on trees move distinctly, and the wind raises dust clouds and drives loose paper across open areas.
- On inland bodies of water, the wind generates noticeable whitecaps (small, breaking wave crests). This air movement also creates resistance when walking directly into the wind.
Real-World Effects on Travel and Outdoor Activities
While 10 to 20 mph winds are not structurally damaging, they significantly impact travel and outdoor plans, requiring adjustments.
Driving
Drivers of high-profile vehicles (vans, trucks, or those towing trailers) will feel a distinct lateral push, necessitating constant steering corrections. The subtle push from crosswinds is most noticeable when crossing exposed bridges or passing gaps in terrain.
Water Activities
The Moderate to Fresh Breeze range presents challenging conditions for small, unmotorized craft. Paddleboards and canoes become difficult to control, and frequent whitecaps make the water choppy and unstable.
On Land
Outdoor dining is quickly disrupted by lightweight items being blown off tables. Setting up lightweight tents or shelters can be a struggle, but this wind speed is ideal for flying kites, as it provides consistent lift.